Compensating device for sash windows and the like



Aug. 6, 1935. K. BRAUN COMPENSATING DEVICE FOR SASH WINDOWS AND THE LIKEFiled July 2, 1934 Patented Aug. 6, 1935 i 2,010,214 v UNITEDSTATES-PATENT"OFFICE COMPENSATING DEVICE FOR SASH WINDOWS AND THE LIKEKarl Braun, Augsburg, Germany Application'July 2, 1934, Serial No.733,371 In Germany July 3, 1933 Claims. (01. 16-198) My inventionrelates to sash windows having and their orderly dropping into thegrooves is devices for compensating the weigh t of the sash, ensured. Ifthe shaft were disposed horizontally the cords of which, when thesash,.is raised, will the wound portions of the cord would, because bewound upon one or more spring controlled of the angle of inclination ofthe grooves, press 5 rollers or drums. against their flanks. In order toprevent exces- 5 According to this invention the/object of which sivefriction from this cause the shaft is therefore is to ensure the sashcords being 'wound properly, according to the invention, inclined to thehorithe rollers or drums are mounted rotatably upon a zontal to such anextent with regard to the pitch stationary shaft in such a manner, thatduring of the grooves that the cords will chafe against each revolutionthe rollers will travel sideways the flanks of the grooves, but willdrop into the 10 a distance equal to the thickness of the cord. bottomsthereof.

Agreeably to this purpose the end of the shaft upon It is of course,within the scope of the invention which the roller rides and the bore-ofthe roller to provide separate compensating devices for are providedwith threads engaging one with the each of the. cords 5 and 6; thegrooves on the other. The rollers rotating when the sash is drum wouldin that case be single-threaded. But 15 raised will consequently atevery rotation also a great deal of material, and also of space, is movea certain distance sideways along the shaft. saved by the embodimentjust now described The drawing shows, by way of example, a pre- I since,as shown in the drawing, on the right hand ferred form of the sashwindow embodying the side of the window a second compe ev e invention.for a second window sash could conveniently be 20 In the drawing, Iindicates the stationary shaft placed. of the compensating device whichis supported What I claim is: in blocks 2 and'a attached to the windowframe, 1. A comp n i vi f r sash windows and 4 indicates a drum likeroller the surface of which the like, comprising a stationary shafthaving a is provided with a pair of identical grooves for the threadedportion, a grooved drum rotatably 25 accommodation of the sash cords 5and 6 from mounted on said shaft and havin a threaded which the sash issuspended. The drum 4 is of bore engaging the threads on said shaft soas to conical shape and the grooves form a double move uniformlylengthwise thereonwhile being thread thereon. The two grooves beingidentical rotated, and tensioning means for rotating said both sashcords 5 and 6 may be wound side by drum. 30 side on one and the samedrum. For the purpose 2. A compensating device for sash windows,

- of guiding the cord 6 twoguide rollers 8 and 9 and the like,comprising a stationary shaft havare provided which are fastened to theblock 2 ing a threaded portion, a grooved drum rotatably and the windowframe respectively. l0 indicates mounted on said shaft and having athreaded bore a cylindrical helical tension spring, one end of engagingthe threads on said shaft so as to move which is connected to the drum4, while the uniformly lengthwise thereon while being roother end isfastened to the worm wheel ll of a ,tated, tensioning means for rotatingsaid drum,

9 self checking worm gear. By a turn of the worm and means foradjustingsaid tensioning means.

l2 which is journalled in hearings on the block 3. A compensating devicefor sash Windows, and

r 40 3, the tension on the spring it] may be adjusted the like,comprising a stationary shaft inclined 40 to the exact degree necessaryfor compensating to the horizontal and having a threaded portion, .theweight of the sash. I3 indicates a thread on a conical grooved drumrotatably mounted on said the shaft 1 which engages with a correspondingshaft and having a threaded bore engagingthe thread in the bo e o the dum 4- I threads .on said shaft so as to move uniformly The devicefunctions as follows: lengthwise thereon while being rotated, tension-When the sash l is raised the load on the ing means for rotating saiddrum, and means for sp g in is reduced, and the spring xp n gcontrolling said tensioning means.

to a corresponding degree will rotate the drum 4 4. A compensatingdevice for sash windows, which will'thus be caused to travel laterallyalong and the like, comprising a stationary shaft inthe threaded portionof the shaft I, while the clined to the horizontal and having a threadedraising of the sash is continued. The rate of portion, a grooved conicaldrum rotatably mountprogress of this lateral movement is such that theed on said shaft and having a threaded bore inproper relative positionof the taking-up portions engagement with the threads on said shaft soas of the grooves on the drum to the successive porto move, uniformlylengthwise thereon while being tions of the cords 5 and G is'maintainedcontinually rotated, and a tension spring encircling said shaft andhaving one end attached to said drum for rotating the same.

5. A compensating device for sash windows, and

a grooved conical drum rotatably mounted on said shaft and having athreaded bore in engagement with the threads on' said shaft so as tomove uniformly lengthwise thereon while being rotated,

and a tension spring encircling said shaft and having one end attachedto said drum for rotating the same, a worm-wheel on said shaft havingsecured thereto the other end of said tension spring, and a worm forrotating said worm-wheel to thereby control the tension of saidspring.

KARL BRAUN.

